71 lines
1.6 KiB
HTML
71 lines
1.6 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD W3 HTML 2.0//EN">
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<!Originally converted to HTML using LaTeX2HTML 95 (Thu Jan 19 1995) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds >
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<HEAD>
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<TITLE> = (PREDICATE)</TITLE>
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</HEAD>
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<BODY>
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<meta name="description" value=" = (PREDICATE)">
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<meta name="keywords" value="lp">
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<meta name="resource-type" value="document">
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<meta name="distribution" value="global">
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<P>
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<BR> <HR>
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<A HREF="node78.html"><IMG ALIGN=BOTTOM ALT="next" SRC="next_motif.gif"></A>
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<A HREF="node72.html"><IMG ALIGN=BOTTOM ALT="up" SRC="up_motif.gif"></A>
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<A HREF="node76.html"><IMG ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif"></A> <BR>
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<A HREF="lp.html"><B>Contents</B></A>
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<B> Next:</B>
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<A HREF="node78.html"> <> , <=, </A>
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<B>Up:</B>
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<A HREF="node72.html"> Appendix: Selected Lisp </A>
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<B> Previous:</B>
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<A HREF="node76.html"> 1+1- (FUNCTIONS)</A>
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<BR> <HR> <P>
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<H1> = (PREDICATE)</H1>
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<P>
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<b> Format:</b>
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<tt> (= <num1> <num2> ...)</tt>
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<P>
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<b> Required arguments:</b>
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1
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<P>
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<tt> <num1> </tt> must evaluate to a number
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<P>
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<b> Optional arguments:</b>
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arbitrary
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<P>
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<tt> <num2> ...</tt> must all evaluate to numbers
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<P>
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<b>=</b> returns T if all the arguments are numerically equal to each other; it returns NIL otherwise.
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<P>
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<b> Examples:</b>
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<P>
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<BLOCKQUOTE>
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<PRE>> (= 2)
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T
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> (= 2 3)
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NIL
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> (= 2 3 4)
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NIL
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> (= 2 2 2 2 )
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T
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> (= 2 2 3 2)
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NIL
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> (= 2 'a)
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Error: A is not of type NUMBER.
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</PRE>
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</BLOCKQUOTE>
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<P>
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<BR> <HR>
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<P>
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<ADDRESS>
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<I>© Colin Allen & Maneesh Dhagat <BR>
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March 2007 </I>
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</ADDRESS>
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</BODY>
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